Meh, everyone's looking for excuses if you ask me. Maybe there's an issue with the grass as well, I don't really care about that either.
Professional football players should be able to play the game under different circumstances. It's not like they're playing with their hands tied behind their back on a concrete street while being shot at by mud wrestling midgets...
Not a source you would understand I'm afraid (it's in Dutch).
During the programs covering the opening games, there was an Adidas representative in the Belgian tv studio. A lot of criticism was pointed at the ball because it was supposed to be even lighter than the previous one.
Turns out that it isn't. This one is 7 grams heavier than the previous one. Not exactly a big difference, but it does show that a good number of players may not know what they're talking about.
Has there ever even been a tournament where players weren't complaining about the ball?